In September 2001, when the U.S. Senate unanimously voted to use all necessary and appropriate force against those responsible for the attacks of Sept. 11, we knew our enemy: Osama bin Laden and his Al Qaeda network. Within a month, the United States began combat operations in Afghanistan, whose Taliban-led government had provided a haven for the terrorist organization.
Today, nearly 10 years later, we have accomplished what President Obama called the "most significant achievement to date" in our war against Al Qaeda: Bin Laden is dead. And according to CIA Director Leon Panetta, there may be as few as 50 members of Al Qaeda residing in Afghanistan.
Although we must remain vigilant in our efforts to defeat Al Qaeda and must continue our support for the Afghan people, there is simply no justification for the continued deployment of 100,000 American troops in Afghanistan. This July, the president should expedite his promised withdrawal of our combat forces. Moreover, we should now set an end date for the U.S. deployment there.
As quickly as can be safely accomplished, American forces should be drawn down to a point where they are sufficient only to conduct targeted counter-terrorism operations, train Afghan security forces and protect American and coalition personnel. Richard Haass, the president of the Council on Foreign Relations, has suggested that 10,000 to 25,000 troops would be adequate to fulfill this mission and that this level could be safely reached within 12 to 18 months.
http://www.latimes.com/news/opinion/commentary/la-oe-boxer-afghanistan-20110527,0,3952920.story